We make Di2 battery holders for 25.4mm seat posts with various inside diameter size options. If you are using a seatpost not listed here, please contact us for assistance.
C2 - 19 mm ID (Carbon)
C3 - 19.5 mm ID (Aluminum)
SAVE - (uncut - tapered) (BETA limited testing)
BBB Basic - 19.65 mm ID (Aluminum)
SLK Carbon - 20.5 mm ID (Carbon)
Zipp Service Course SL Carbon - 22 mm mm ID (Carbon)
Ad hoc solutions using tape and foam have multiple issues. The net result is often a damaged or stuck battery.
Problems with Tape or Foam:
Removing the holder requires pliers. Never use pliers on the battery itself.
COVID-19 is impacting us all. By now you have received notifications from everyone related to this serious crisis. Bup Labs is still open for business, but we are also providing help to various entities related to COVID-19 care. As a result of the additional efforts and the lack of some supplies used in our manufacturing processes, our production has slowed. We have taken extra precautions to ensure environmental safety is adhered to for both incoming and outgoing products and materials. We appologize for the delays and ask for your patience during this trying time.